Quote:
Originally Posted by Electronic M
Theses never shipped with P1 tubes that I know of. This set is the only application of the 3KP4 AFAIK so there weren't tons of replacements laying around even back then. The TV37 was the cheapest pre-built TV on the market when it was sold and had the smallest screen you could get...Short of portable applications that set probably wasn't desirable enough to put a CRT in once it was 5 years old.
I also have seen first hand a power rectifiers tube in one of these sets fail and pop the CRT heater... I'm just glad it wasn't my set.
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Why would the CRT heater open if the LV rectifier tube failed? I wouldn't have thought an LV rectifier failure would have anything to do with the filaments in any tube in the TV, unless the failure somehow caused an abnormal increase in heater voltage; even then . . . I just cannot imagine how a failure like this could have caused an increase in CRT heater voltage, or of any other tube in the set.
BTW, it will not be easy to find a replacement for a 3KP4 CRT. This TV was made in the late 1940s, when television was just starting in North America. A new tube will almost certainly be impossible to find. Your best bet would be to try to find a 3KP4 in a junked set, if possible.